1.  public static String imgToBase64(InputStream inStream) {
  2.         byte[] data = null;
  3.         try {
  4.             //available()获取长度
  5.             data = new byte[inStream.available()];
  6.             System.out.println(inStream.available());
  7.             inStream.read(data);
  8.             inStream.close();
  9.         } catch (IOException e) {
  10.             e.printStackTrace();
  11.         }
  12.         BASE64Encoder encoder = new BASE64Encoder();
  13.         //"\\s"去除空白符
  14.         return encoder.encode(data).replaceAll("\\s*", "");
  15.     }
  1. public static String getImgBase64(List<Marker> markers) {
  2.         // 获取url
  3.         String imgUrl = getBaiduUrlParameters(markers);
  4.         System.out.println(imgUrl);
  5.         // 发送请求
  6.         InputStream is = null;
  7.         URL url = null;
  8.         try {
  9.             url = new URL(imgUrl);
  10.             HttpURLConnection conn = null;
  11.             conn = (HttpURLConnection) url.openConnection();
  12.             conn.setConnectTimeout(3000);
  13.             conn.setRequestMethod("GET");
  14.             if (conn.getResponseCode() == 200) {
  15.                 is = conn.getInputStream();
  16.                 String contentType = conn.getHeaderField("Content-Type");
                    //判断返回值类型
  17.                 if (contentType.contains("image")) {
                        //这里的直接获取的InputStream需要进一步处理
  18.                     return imgToBase64(new ByteArrayInputStream(readStream(is)));
  19.                 }
  20.             }
  21.             is.close();
  22.         } catch (IOException e) {
  23.             e.printStackTrace();
  24.         }
  25.         return null;
  26.     }
  1. public static byte[] readStream(InputStream inStream) throws IOException {
  2.         ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
  3.         byte[] buffer = new byte[1024];
  4.         int len = -1;
  5.         while ((len = inStream.read(buffer)) != -1) {
  6.             outSteam.write(buffer, 0, len);
  7.         }
  8.         outSteam.close();
  9.         inStream.close();
  10.         return outSteam.toByteArray();
  11.     }
  1. #test {
  2.   background: url(data:image/gif;base64,R0lGODlhHAAmAKIHAKqqqsvLy0hISObm5vf394uLiwAAAP///yH5B…EoqQqJKAIBaQOVKHAXr3t7txgBjboSvB8EpLoFZywOAo3LFE5lYs/QW9LT1TRk1V7S2xYJADs=) no-repeat center;
  3. }
  1. <img src="data:image/gif;base64,R0lGODlhHAAmAKIHAKqqqsvLy0hISObm5vf394uLiwAAAP///yH5B…EoqQqJKAIBaQOVKHAXr3t7txgBjboSvB8EpLoFZywOAo3LFE5lYs/QW9LT1TRk1V7S2xYJADs=">

减少前端图片网络请求次数，便于传输

不便于修改，影响代码阅读，转成的base64字符串比原始图片体积更大，所以大图片转成base64后反而请求更慢

在图标之类不常修改，且图片较小时使用base64可以优化网页速度

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本文链接：https://www.cnblogs.com/GuoJunwen/p/9442952.html